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I know OSE used to provide link data from these domains. But I have been doing link profile lookups on sites that I know have links from these domains - and they don't show up in my results. Just to make sure, they don't even show up when I sort the sites by domain authority.

Another reason is that we just don't have the same size server farm that Google and Bing have. We could crawl all of Twitter and get nothing else crawled, or we could crawl some of Twitter, and some of the rest of the web. We aren't able to crawl all of the web, and we release a new index about once a month, so that's why you don't see all of your links or see them right away.

However, what we do offer that is different from Google and Bing is that we show you links for sites that are not your own, we add metrics about the trust and authority of the page, etc.

Yep, having a good split of nofollow and dofollow are usually more natural.

Links on sites like Wikipedia are not always a huge indication of authority due to the filtering Wikipedia is physically able to do. There are some spammy sites that get dropped in there. Matt Cutts even stated Wikipedia links will not affect your rankings at all.

However, grabbing from the citations may be able to generate links, but nofollow links from authoritative sites will not help you.

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